Priority Energy, Energy Code Facts, IL

Reduce the Cost of Energy Code Compliance!

With the adoption of the International Energy Conservation Code (IECC), home building and commercial construction has taken on an extra layer of complexity. The code is intended to increase the efficiency of the homes we’re building through added insulation, air sealing and other efficiency measures. Every three years, the IECC publishes a new version (see how the code has changed over time).

The IECC code is customized per location and climate zone. The state of Illinois falls into either Climate Zone 4 (mid to southern Illinois) or Climate Zone 5 (mid to northern Illinois). IECC Energy Codes layout a prescriptive path for compliance which requires specific levels of insulation, mandatory building performance testing and requirements for mechanical systems (heating, cooling, ventilation and water heating) which must be met to comply with the code.

Alternative Methods of Compliance

The IECC has always offered alternative, performance-based methods of compliance, including:

U-Average

Rather than using a specific insulation value in each area of the house, your home simply needs to use the same amount on average, offering tradeoffs in R-values across the home.

Performance Path

This allows the home’s estimated cost of heating, cooling and water heating to be calculated and compared to a home built on prescriptive standards. This does not take into account mechanical efficiencies (except for ventilation), and is focused on the building envelope only. If the home being built is equal to or more efficient than the prescriptive home, it complies with code.

Energy Rating Index

Starting with the IECC 2015 version of the code, there is another method to prove compliance which allows the entire home’s energy usage to be taken into account (building envelope, heating, cooling, lighting, appliances, and ventilation): the Energy Rating Index, such as the HERS Index.

Additionally, through feedback from various parties--including the National Association of Home Builders (NAHB), the Midwest Energy Efficiency Alliance (MEEA), manufacturers and building science professionals like Priority Energy--the State of Illinois amended the code effectively adopting our own version of the IECC Energy Codes.

Confused yet? Don’t worry – we can help. Please see our Energy Code Assistance page or call us at 800-737-2299 to learn more.

  • Thank you again and you will be the first person I call if I need additional part or service from your company.
    Anonymous
  • I just wanted to send this message to all you and say GREAT JOB!  We had a rough inspection today and passed for the Woodward Ave. house. The inspector told us "if every house I inspected looked like this one I would be out a job".

    Anonymous Builder
  • We were so impressed with the amount of information the Priority Energy technicians gave us during our ENERGY AUDIT.  If you are buying a house, I would strongly recommend having them do an energy audit on it, in addition to your usual home inspection.

    P.I.
  • Thanks for a super intelligent and deep seminar expertly handled by a staff which was a pleasure to be around. Lunch was superbly and subtly handled.

    A.S. Architect
  • I wanted to thank you for all of your extra time and energy during our BPI training over the last few weeks. You really helped put things in perspective. You are an awesome crew and your facility is a valuable resource for students and the community

    BPI Student, L.E.
  • There is much less dust in the house and the monthly gas and electric charges have been reduced by 10 to 15%.....I'm sure I will see greater savings over a twelve month period......thanks again.

    Aeroseal Client, R.N.

Latest News

Recognized for their outstanding service for the second year in a row, Priority Energy was awarded the distinction of Top Chicago area Aeroseal dealer.
Priority Energy and Nitti Development in Elmhurst, IL
At Priority Energy, our mission is simple - we want to better the lives of our customers by improving the buildings they live and work in.  Everyone at Priority Energy is driven by this one goal, and this often leads us to customers and partners with the same mindset.